Recognised as Colour
#218B8B
- #218B8B
- Cyan
- Dark
- Nearest: Dark cyan
#218B8B is a cyan with RGB values 33, 139, 139 and HSL 180°, 62%, 34%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Dark cyan.
Colour values
#218B8B#218B8B
HEX#218B8B
RGBrgb(33, 139, 139)
RGB (0–1)0.1294, 0.5451, 0.5451
RGB percentages12.9%, 54.5%, 54.5%
HSLhsl(180, 61.6%, 33.7%)
HSV / HSBhsv(180, 76.3%, 54.5%)
CMYK76.3%, 0%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,198,411
CSS custom property--colour: #218B8B;
Brightness & contrast
Relative luminance0.20653WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.13:1
Contrast with white4.09:1WCAG normal text: Fail
Contrast with black5.13:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#DE7474
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.09:1WCAG large text: AA
Contrast with black, large text5.13:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#8B2121
Analogous#218B56, #21568B
Triadic#8B218B, #8B8B21
Split complementary#8B2156, #8B5621
Tetradic#56218B, #8B2121, #568B21
Tints, shades & saturation
Channel breakdown
R33
G139
B139
Red33 (12.9%)
Green139 (54.5%)
Blue139 (54.5%)
Hue180°
Saturation (HSL)61.63%
Lightness33.73%
Dominant channelGreen and Blue
Hex per channelR 21 · G 8B · B 8B
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